Olive oil is available in many forms such as extra virgin, cooking olive, pomace
olive etc, Trans fatty acids are the result of over processing, over using oils or
using rancid oils. Just how processed foods such as cheese, butter, margarine,
mayonnaise etc all contain trans fats,similarly, over used oils i.e when the same oil
is repeated for frying, cooking etc trans fats are produced. This could occur in any
quality of oil even if it is olive. Thus, the technique and frequency of using
appropriate oil matters when it comes to health.